Scientists are particularly alarmed at this study because frogs, newts, salamanders and other amphibians are especially sensitive to their environment. Amphibians are therefore often seen as barometers that provide early warnings about the health of their immediate habitats.

Exactly what is causing the declines is not clear. Loss of habitat is one reason, but population declines are seen in remote areas of the world as well. Amphibians are also susceptible to fungal infections that increase when the animals are under stress.

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